framebuffer.inl

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/*
    toxic - A Global Illumination Renderer
    Copyright (C) 2003-2004 Francois Beaune
    Contact: http://toxicengine.sourceforge.net/

    This file is part of toxic.

    toxic is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    toxic is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with toxic; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

inline
int Framebuffer::GetWidth() const {
    return m_width;
}

inline
int Framebuffer::GetHeight() const {
    return m_height;
}

inline
int Framebuffer::GetPixels() const {
    return m_pixels;
}

inline
sheep::Real Framebuffer::GetPixelWidth() const {
    return m_inv_width;
}

inline
sheep::Real Framebuffer::GetPixelHeight() const {
    return m_inv_height;
}

inline
sheep::Point2 Framebuffer::ConvertToNDC(int x, int y) const {
    assert(x >= 0 && x < m_width);
    assert(y >= 0 && y < m_height);

    return sheep::Point2(
        (1 + x + x) * m_half_inv_width - 0.5,
        0.5 - (1 + y + y) * m_half_inv_height);
}

inline
void Framebuffer::ConvertFromNDC(const sheep::Point2 &p, int *x, int *y) const {
    assert(p.m_x >= -0.5 && p.m_x <= 0.5);
    assert(p.m_y >= -0.5 && p.m_y <= 0.5);
    assert(x && y);

    // Discard fractional parts.
    *x = std::min(static_cast<int>(m_width * (p.m_x + 0.5)), m_width - 1);
    *y = std::min(static_cast<int>(m_height * (0.5 - p.m_y)), m_height - 1);
}

inline
Color3 Framebuffer::GetPixel(int x, int y) const {
    assert(x >= 0 && x < m_width);
    assert(y >= 0 && y < m_height);

    switch(m_format) {
    case RGB_FLOAT_32:
        {
            const pixel_rgb_float_32 *p = &m_bits.m_rgb_float_32[y * m_width + x];
            return Color3(p->m_r, p->m_g, p->m_b);
        }
        break;
    default:
        assert(!"Unknown framebuffer format.");
        return Color3(0.0); // keep the compiler happy
    }
}

inline
void Framebuffer::SetPixel(int x, int y, const Color3 &color) {
    assert(x >= 0 && x < m_width);
    assert(y >= 0 && y < m_height);

    switch(m_format) {
    case RGB_FLOAT_32:
        {
            pixel_rgb_float_32 *p = &m_bits.m_rgb_float_32[y * m_width + x];
            p->m_r = static_cast<sheep::float32>(color.m_r);
            p->m_g = static_cast<sheep::float32>(color.m_g);
            p->m_b = static_cast<sheep::float32>(color.m_b);
        }
        break;
    default:
        assert(!"Unknown framebuffer format.");
    }
}

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